Question

1. 4/9 - (-2)2. 3/20 - 1.1 - 4/53. 6.3/1.2 + 2.3/ это дробь

Answer 1

Ответ: все в объяснении

Пошаговое объяснение:

1. 4/9 - (-2)

4/9 + 2

4/9 + (2*9)/(1*9)

4+18/9

22/9 <---сокращаем дробь

2 4/9 (две целых и четыре девятых)

2. 3/20 - 1,1 - 4/5

3/20 - 11/10 - 4/5

3/20 - 11*2/10*2 - 4*4/5*4

(3 - 22 - 16)/20

- (35/20) <---сокращаем дробь

-(1 3/4)  (минус одна целая и три четвертых)

3. 6,3/1,2  + 2,3 <-----это можно решить двумя способами

3.1 63/10 : 12/10  + 23/10

63*10/10*12  +23/10

630/120 + (23*12)/(10*12)

630+276/120

906/120 <------сокращаем дробь

7 11/20 (семь целых одиннадцать двадцатых)

3.2 6,3:1,2+2,3 = 7,55

мы заменили дробь на знак деления в этом случае, решив все в десятичных, а не переходя на обычные. Я бы решил вторым способом

Answer 2

1. To simplify the expression 4/9 - (-2)², we can first simplify the exponent: (-2)² = (-2) * (-2) = 4. Now we have 4/9 - 4. To subtract fractions with different denominators, we need to find a common denominator. The common denominator here is 9. Rewriting 4 as 4/1, we have (4/1)/9 - 4/9. Now, we can subtract the fractions: (4/1 - 4)/9 = 0/9 = 0.

2. To simplify the expression 3/20 - 1.1 - 4/5, we first convert the decimal 1.1 into a fraction. 1.1 can be written as 11/10. Now we have 3/20 - 11/10 - 4/5. To subtract fractions with different denominators, we need to find a common denominator. The common denominator here is 20. Rewriting the fractions with the common denominator, we have 3/20 - 22/20 - 16/20. Now we can subtract the fractions: (3 - 22 - 16)/20 = -35/20 = -7/4 or -1.75.

3. To simplify the expression 6.3/1.2 + 2.3, we first convert the decimal 6.3 into a fraction. 6.3 can be written as 63/10. Now we have 63/10 / 1.2 + 2.3. To divide a fraction by a whole number, we multiply the fraction by the reciprocal of the whole number. The reciprocal of 1.2 is 1/1.2. So, we have (63/10) * (1/1.2) + 2.3. Simplifying the fractions, we get 63/10 * 10/12 + 2.3. Cancelling out the common factors, we have 63/12 + 2.3. Now we can add the fractions: (63 + 27)/12 = 90/12 = 7.5. Finally, adding 7.5 and 2.3, we get 7.5 + 2.3 = 9.8.

Therefore:

1. 4/9 - (-2)² = 0
2. 3/20 - 1.1 - 4/5 = -7/4 or -1.75
3. 6.3/1.2 + 2.3 = 9.8